<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ this.city }}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  computed: {
    // 映射vuex中的mapState的city数据到本组件的计算属性city上
    ...mapState(['city'])
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  },
  methods: {
    handleCityClick (city) {
      // 触发changeCity的action
      // this.$store.dispatch('changeCity', city)
      // 直接调用mutations
      // this.$store.commit('changeCity', city)
      // 上述代码可修改为如下代码
      this.changeCity(city)
      // 编程式导航: 跳转到首页
      this.$router.push('/')
    },
    // 映射vuex中名为changeCity的mutation到本组件的changeCity的方法上
    ...mapMutations(['changeCity'])
  },
  watch: {
    // 监听letter的变化
    letter () {
      // console.log(this.letter)
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped="scoped">
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    /* 禁止滚动 */
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
  .title
    line-height: .54rem
    background: #EEEEEE
    padding-left: .2rem
    color: #666666
    font-size: .26rem
  .button-list
    padding: .1rem .6rem .1rem .1rem
    overflow: hidden
    .button-wrapper
      float: left
      width: 33.33%
      .button
        text-align: center
        margin: .1rem
        padding: .1rem 0
        border-radius: .06rem
        border: .02rem solid #ccc
  .item-list
    .item
      line-height: .76rem
      padding-left: .2rem
</style>
